MA H1923

Raises Massachusetts' age of criminal majority from 18 to 21 through a phased implementation: to age 19 initially, then to 20 on July 1, 2028, and finally to 21 on July 1, 2030

Expands juvenile court jurisdiction to include 18, 19, and 20-year-olds, allowing them to be treated as juveniles rather than adults in the criminal justice system

Prohibits individuals under 21 from being held in adult Department of Correction facilities, including MCI Cedar Junction, Norfolk, Concord, Framingham, and other state prisons

Extends probation and commitment periods in juvenile cases to align with the raised age thresholds, with maximum supervision extending to age 23 for offenses committed at age 18 or older

Amends approximately 90 sections across multiple chapters of Massachusetts General Laws to replace references to "18 years of age" with "the age of criminal majority"